Operating Principle; Boiler Control; Temperature Control; Low Water Level Protection - REMEHA GAS 210-80 ECO PRO Technical Information

15. Efficiency data and gas inspection labels GAS 210 ECO PRO

15.8 Operating principle

The inlet side of the fan is fitted with a venturi, where air and g as
are mixed according to a fixed ratio. When there is a heat demand,
the fan will pre-vent. The fan draws in the combustion air , which is
mixed with the gas to optimum ef fect in the venturi. The fan moves
the homogenous gas/air mixture through to the burner . The mixture
is then ignited by the combined ignition and ionisation electrode,
which also monitors the flame. Combustion then takes place. Fol-
lowing combustion, the hot flue gases pass through the cast alumin-
ium heat exchanger. Here, the flue gases release their heat to the
heating water in the heat exchanger. The heat output of the boiler is
controlled on the basis of the settings and the prevailing water tem-
peratures that are measured by the temperature sensors. With flue
gas temperatures below dew point (approx. 55°, the temperature at
which the water vapour in the flue gases starts to condense), the
water vapour in the flue gases will condense in the lower part of the
heat exchanger. The heat released during this condensation proc-
ess (called latent heat or heat of condensation) is also transferred
to the heating water. The condensed water is discharged through a
trap. The flue gases flow through the condensate collector and are
discharged via the flue gas discharge pipe.
The advanced control system of the boiler , the abc , guaran-
®
tees extremely reliable heat supplies. This means that the boiler
responds quickly and efficiently to negative environmental influ-
ences (such as hydraulic flow problems, air flow problems, etc.). If
problems of this kind occur, the boiler will not lock out, but initially
modulate down and, depending on the nature of the problem,
switch off temporarily (shutdown or control stop) and try again
after a pre-determined time. Providing the situation is not hazard-
ous, the boiler will always continue to attempt to provide heat. For
a continuous supply of heat, the boiler requires a minimum flow of
30 % of the nominal flow at the relevant design temperatures. The
boiler can be equipped with a second return for CT circuit (avail-
able as an accessory). The second return can contribute additional
efficiency if the installation includes dif ferent temperature groups.

15.9 Boiler Control

15.9.1 Temperature control

The Remeha Gas 210 ECO PRO is equipped with electronic tem-
perature control based on flow, return and boiler block temperature
sensors. The flow temperature is adjustable between 20 and 90°C
(factory setting 80°C).

15.9.2 Low water level protection

The Remeha Gas 210 ECO PRO is equipped with low water pro-
tection based on temperature difference measurements and tem-
perature increase measurements.
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